<html>
<script>
    // 1*2*3*4*5*......*100
    // n * (n - 1)
    function name(params) {
        if (params < 1) {
            return 1
        }
        return params * name(params - 1)
    }
    // console.log(name(20))

    function fb(n) {
        let arr = []
        if (n == 1 || n == 2) {
            return 1
        }
        return fb(n-1)+fb(n-2)
    }
</script>

</html>